HA is a wonderful thing for obvious reasons but you do have to tread carefully sometimes when designing and deploying it. I am specifically referring to the appliances / applications themselves and their physical location. Some appliances need to be located on the same subnet, which usually means physically very close. You can often fudge this by extending the layer 2 domain (such as using OTV) but this can be dangerous due to latency etc which can cause some unpredictable results, and not always practical.
MSE (7.4) is one of these applications. It maintains a health monitor connection to keep the two appliances synchronised and up to date.
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